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Title: Electric propulsion motor for marine vehicles

An electric propulsion motor for marine vehicles is described comprising: a disk-shaped rotor and two coaxial disk-shaped stators, the rotor being separated from each of the stators in an axial direction by an air gap; the rotor including a plurality of permanent magnets that produce a first magnetic field; each stator comprising an armature winding that is connected to a source of electrical current to produce a second magnetic field, the first and second magnetic fields being capable of interacting to create an electromagnetic torque; means for coupling the rotor to a propeller shaft for transferring the torque from the rotor to the shaft, and means for detecting the angle of the shaft; a current control means for receiving a current control signal and for employing pulse width modulation to control the source of electrical current; the current control means including means for storing compensation information related to torque variations that are a function of shaft angle; the current control means further including means connected and responsive to the shaft angle detecting means for selecting the compensation information as a function of shaft angle and means for combining the compensation information with the current control signal to control the sourcemore » of electrical current such that the torque variations that are a function of shaft angle are minimized; and wherein the means for coupling the rotor to the propeller shaft includes means within the motor for isolating the shaft from sound produced by the motor.« less
Authors:
; ; ;
Publication Date:
OSTI Identifier:
6312996
Report Number(s):
US 5229677; A
PPN: US 7-764505
Resource Type:
Patent
Resource Relation:
Patent File Date: 18 Sep 1991
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; PROPULSION SYSTEMS; ELECTRIC MOTORS; SHIPS; ELECTROMAGNETS; MECHANICAL SHAFTS; MECHANICAL VIBRATIONS; NOISE POLLUTION; PERMANENT MAGNETS; ROTORS; SPEED REGULATORS; STATORS; CONTROL EQUIPMENT; ELECTRICAL EQUIPMENT; ENGINES; EQUIPMENT; MACHINE PARTS; MAGNETS; MOTORS; POLLUTION; SHAFTS 330300* -- Advanced Propulsion Systems-- Electric-Powered Systems